Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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TITLE
METHOD OF COLORING PANNED CONFECTIONERIES
WITH INK-JET PRINTING
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention generally relates to a method of coloring panned
confectioneries. In particular, the present invention relates to a method of
applying the color coat on panned confectioneries using ink-jet techniques.
Related Background Art
[0002] Panning and film coating are industrial processes for preparing coated
edible products, such as confections and pharmaceuticals. Panning and some
coating processes are performed in a rotating drum or "pan". Typically, the
term
"panning" is used with regard to the application of sugar-based coatings, such
as,
e.g., sucrose or dextrose, to masses of centers to produce coated products.
Typically, multiple applications of a highly concentrated sugar syrup are used
to
build up the uncolored portion of a sugar shell. This is followed by multiple
applications of a concentrated sugar syrup containing colorant. The term "film
coating" is used with regard to applying coatings that are not based on sugar
to
masses of centers, where the coating material typically comprises film forming
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components, such as a modified cellulose, e.g., hydroxypropyl-methylcellulose
that is continuously applied to the centers until the desired coating
thickness is
achieved.
[0003] The panning process comprises the repetitive application of thin layers
of
a coating solution or composition onto an intermixed mass of centers, while
mixing the mass of centers, and the drying of each layer of coating solution
or
composition during which the sugar in the coating crystallizes between the
application of layers. In contrast, as the film coating process does not
require the
crystallization of a sugar shell, film coating is a continuous process,
typically
comprising the simultaneous application of a coating solution, distribution by
mixing, and drying of the coating solution. That is, the film coating sprayers
are
not turned off during the film coating process, but, instead, are run
continuously
until the desired film coating is applied. The film coating solutions
typically
contain less than about 10 percent solids, as higher concentrations would be
too
viscous to spray. However, in each process, coating material is built up on
the
center to form the desired shell or coating.
[0004] If the coating is to be colored, an edible colorant is added to the
coating
solution in the later stages of the coating process. For film coating, a flow
of
colorant is turned on, and added to the film forming composition flow to the
sprayer. For a panned confectionery, following the application of a number of
layers of concentrated syrup coating solution to build up the sugar shell, a
number of applications of a concentrated sugar solution containing a colorant
are
applied to provide the color coat. The color coat can require up to 20
applications of a colored coating solution to achieve the desired color. This
is
because the amount of dye that can be solubilized in the sugar solution is
relatively low due to the high sugar solids content of the sugar coating
solution.
As a result, the process of building the shell, including the coloring steps,
can
take many hours. Film forming processes are also similarly limited due to the
relatively low solubility of the colorant in the film forming component.
[0005] Moreover, each pan is typically dedicated to a specific color, as the
amount of work required to clean the pan and change colors is extensive, and
requires a prohibitive amount of time. As a result, providing colored centers
in a
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blend of colors typically requires a number of coating pans, one for each
color. If
one of the pans must be taken out of operation for any reason, such as for
repairs
or maintenance, the entire blending operation must be halted until the pan is
running again. The requirement for a separate pan for each color inhibits the
flexibility of prior art coloring processes, requiring extra equipment or an
extensive amount of work and time to allow for a color change in a blend,
during
which no product is produced.
[0006] Panning and film coating are used to apply coatings to a variety of
different types of centers, including, but not limited to, pellets, tablets,
pills and
molded or granulated products. Examples of coated centers include
pharmaceuticals in the form of pills, tablets, and the contents of time-
release
capsules, chemical products, such as detergents, and foodstuffs, such as
candy.
Coatings are typically used to prevent degradation and decomposition of the
centers from exposure to air and humidity, to give the coated object a
decorative
appearance, and have been known to prevent the melting of certain chocolate
candies in consumer hands.
[0007] Panning and film coating apparatus and processes performed by them for
coating centers are well known in the art. A typical panning or film coating
apparatus comprises a coating pan and mechanisms for introducing a coating
solution and a drying gas into the pan. In panning, for example, a mass of
centers
is introduced into the coating vessel. The mass of centers is then intermixed,
a
layer of the coating solution is applied to the centers, and the coating layer
is
dried with the drying gas. The coating may be dispersed by spraying or pouring
the coating solution onto the mass of centers. Applying the coating solution
while intermixing the mass of centers prevents the coated centers from
adhering
to each other, and helps insure uniformity. The drying gas, which is often air
or
dry air, may be introduced simultaneously, with or subsequent to, the
application
of the coating solution.
[0008] Examples of panning apparatus and techniques include the disclosure of
U.S. Patent No. 2,652,805 to D'Angelo, which discloses an apparatus for
coating
tablets, pills, and other small objects. The disclosed coating apparatus
comprises
a rotating drum, a drive motor, and optionally, one or more blowers. Pills or
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tablets placed in the drum are tumbled or intermixed by the rotation of the
drum.
A coating material, added to the drum, is distributed onto the surface of the
pills
or tablets. Multiple coats of one or more coating materials may be applied
with
the apparatus.
[0009] U.S. Patent No. 3,357,398 to Gross discloses a method and apparatus for
coating tablets. The apparatus comprises a tiltable perforated drum or pan
mounted on a shaft within a housing, a drive motor, and a mechanism for
forcing
a drying medium, i.e., air, through an inlet in the housing, through the
perforated
pan, and out an outlet. Tablets are loaded in the perforated drum, which is
then
rotated to mix them. An atomized coating material is sprayed onto the tablets
and
the drying medium is passed through the inlet and the perforated drum, as the
tablets are mixed.
[0010] U.S. Patent No. 4,245,580 to Okawara discloses a device for coating
granular solids. The apparatus comprises a double-cone rotary drum, which is
perforated to permit the flow of gas through the drum, a drying gas supply, a
drying gas exhaust, annular insulating covers for the drum, and mechanisms for
tilting and changing the height of the drum to facilitate loading and
unloading.
Coating material is sprayed on granular material in the drum, and the drying
gas
is passed through the drum, as the drum rotates.
[0011] U.S. Patent No. 5,495,418 to Latini et al. discloses an automatic
panning
system that comprises a rotatable drum in which a mass of centers is tumbled
and
coated with a solution to form a shell, a spray arm for applying a coating
solution,
an air flow system to provide a drying air flow, and control means. The
coating
process consists of the repetition of separate spraying, distribution, and
drying
cycles in which the condition of the air, the drum speed, and the cycle timer
are
monitored and controlled by the control means.
[0012] Prior art methods for printing images on panned confectioneries
typically
involve contact techniques, i.e., pad or rotogravure printing. As such
printing
techniques involve contacting the panned product with a printing pad, there is
a
high likelihood of damage to the product during printing. This is particularly
likely with sugar shelled products, when a sufficient amount of time for the
panned shell to cool has elapsed, as the outer shell hardens and stiffens with
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cooling. That is, a sugar shell is somewhat flexible immediately after the
panning
process is completed, such that, when printed with a contact printer, the
shell
flexes, and is less prone to cracking than when the shell has had the time to
cool.
Therefore, shelled panned confectioneries typically cannot be stored prior to
printing with prior art contact printing techniques. As a result, custom
orders on
which a printed image is desired require a freshly panned product, and, thus,
the
time required for custom orders is undesirably long.
[00131 The images that may be obtained on panned confectioneries with such
contact printing techniques may also leave much to be desired, as contact
printing
works best with planar or substantially flat objects, and the surfaces of
panned
confectioneries are rarely flat. This limits the amount of the surface of the
panned product upon which an image can be formed with contact printing
techniques. As a result, it is extremely difficult, if not impossible, to
color or
form an image on the entire surface of a panned product using contact
printing.
Moreover, contact printing techniques do not provide full color images on
colored backgrounds or the ability to achieve true color images on dark
backgrounds.
[0014] In addition, changing a coating pan from one color to another is time
intensive. Therefore, multiple coating pans are typically required for the
production of multiple color coatings, which is costly.
[0015] Ink-jet printing involves the production of tiny droplets of ink that
are
_ .
fired by a jet mechanism to a substrate to form an image. A typical ink-jet
printer
has 4 ink-jets heads or assemblies, typically containing 3 complementary
colors
and black to allow the production of a broad range of colors. However, color
printers having as few as 1 ink color or as many as 12 colors are available.
Ink-
jet printing on edible products is disclosed in U.S. Patents Nos. 7,029,112;
7,037,440; 7,884,953 and in US-A-2003/0035870.
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[0016] A method of ink-jet printing on edibles is described in U.S. patent No.
7,884,953. A method for printing multicolor images on the surfaces of shaped
edible pieces is described in US-A-2003/0035870. A method for ink-jet
printing on surface modified substrates is described in U.S. patent No.
7,029,112.
[0017] U.S. Patent No. 5,800, 601 discloses food grade ink-jet inks that are
free
or substantially free of sedimentation. In one example, the disclosed ink was
used for ink-jet printing on M&Ms Brand Chocolate Candies. However, there
is no disclosure of applying at least a portion of a color coat to a hard-
panned,
sugar shelled, pellet-shaped confectionery, having a substantially uncolored
sugar
surface, by ink-jet printing at least one edible ink onto the uncolored
surface of
the confectionery.
[0018] U.S. Patent No. 4,905,589, 5,433,146, and 5,655,453 to Ackley disclose
ink-jet apparatus for marking indicia on pellet shaped articles. The apparatus
comprise a feed hopper, a conveyor, having a plurality of receiving pockets,
into
which pellet shaped articles from the hopper are placed for printing, and an
ink -
jet printer for marking the articles. Printed articles include candies,
pharmaceutical capsules, tablets and the like. However, there is no disclosure
in
any of the Ackley patents of applying at least a portion of a color coat to a
hard-
panned, sugar shelled, pellet-shaped confectionery, having a substantially
uncolored sugar surface, by ink-jet printing at least one edible ink the
uncolored surface of the confectionery.
[00191 Ink-jet printing on edibles, particularly high-resolution, drop-on-
demand,
ink-jet printing, usually requires the use of low viscosity inks that are
readily
ejected through tiny orifices in the ink-jet printhead. As will be recognized,
for
printing on confectionery products, the printing inks used must also be
edible. =
Edible dyes and colorants include natural material, e.g., vegetable colorants,
such
as from beets, grapes, and carrots, that are assumed to be edible, FDA
approved
natural colorants, dyes and colorants approved for human consumption under the
Food, Drug and Cosmetic Act (FD&C), which is administered by the U.S. Food
and Drug Administration (FDA), and colorants approved for human consumption
in other countries.
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[0020] A method of applying the color coat of panned confectioneries with ink-
jet printing, thereby significantly improving the flexibility of the process
and
reducing the time requiredp color the confectioneries, would be highly
desirable. The present invention provides such a method.
SUMMARY OF THE INVENTION.
[00211 The present invention addresses the deficiencies of the prior art,
discussed above, by providing a novel method using ink-jet printing techniques
that provide the ability to produce custom images on sugar shelled
confectioneries, and greatly reduce the amount of equipment required to
produce
blends of differently colored shelled confectioneries. The present invention
is
directed to a method of coloring a hard-panned, sugar shelled, pellet-shaped
confectionery using ink-jet printing. The claimed method comprises placing at
least one hard-panned, sugar shelled, pellet-shaped confectionery, preferably
but
not necessarily having an uncolored sugar surface, in functional association
with
an ink-jet head, applying at least a portion of a color coat to the shelled,
pellet-
shaped confectionery by ink-jet printing at least one edible ink onto the
surface of
the shelled, pellet-shaped confectionery, and drying the color coat. The
method
of the invention allows shelled, pellet-shaped centers to be colored
immediately
after removal from the coating pan, or to be transported and/or stored by any
means known in the art before coloring.
[00221 Preferably, the method of the invention comprises ink-jet printing
edible
ink onto a first side of the shelled, pellet-shaped confectionery, flipping
the
shelled, pellet-shaped confectionery, and ink-jet printing edible ink onto a
second
side of the shelled, pellet-shaped confectionery. The edible ink applied to
the
first side of the shelled, pellet-shaped confectionery may be the same or
different
from the edible ink applied to the second side. The color coat on the shelled,
pellet-shaped confectionery may be all of a single color, a mixture of colors,
or
result in the formation of an image. Where the edible ink forms an image, a
portion of the surface of the shelled, pellet-shaped confectionery may be left
uncolored to form at least a portion of the image and/or the image may be
formed
from a plurality of edible inks. Moreover, a base color coat of an edible ink
may
be ink-jet printed onto at least a portion of the surface of the shelled,
pellet-
'
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shaped confectionery, and at least one other edible ink may then be applied to
the
base color coat to form a pattern or image.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Fig. 1 is an illustration of a hard-panned, sugar shelled, pellet-
shaped
confectionery, printed with the method of the invention; and
[0024] Fig. 2 is a cross-sectional illustration of a hard-panned, sugar
shelled,
pellet-shaped confectionery, printed with the method of the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0025] As used herein, the term "pan" refers to a coating vessel, drum, tube,
or
pan for use in a film coating or panning process. The term "panning" refers to
a
coating or panning process. The term "panning apparatus" refers to an
apparatus
for panning or film coating incorporating a pan.
[0026] As used herein, the term "uncolored surface" means that no color
coating
has been applied to the surface. Therefore, as used herein, the terms
"uncolored
sugar surface" and "uncolored sugar shell" mean that the surface of a sugar
shell
on a panned confectionery is substantially free of any colorant or dye, and
substantially has the appearance of sugar. That is, the sugar shell is
substantially
white. As will be recognized by those of ordinary skill in the art, for
relatively
thin sugar shells, some of the color of the underlying confectionery may be
visible through the sugar shell. Uncolored sugar surfaces and uncolored sugar
shells may contain a pigment, such as titanium dioxide or calcium carbonate,
to
enhance the whiteness of the sugar shell or carbon black to provide a black or
gray surface.
[0027] Also, as used herein, the "uncolored surface" of a candy, such as, for
example, chocolate or a lollipop, is substantially free of any coating of any
additional colorant or dye, and substantially has the appearance and color of
the
candy. The candy will have the color that results from the candy formulation.
For example, the color of an uncolored chocolate surface is brown, and the
uncolored surface of a lemon lollipop is yellow.
[0023] As used herein, "water-based" means containing more water than non-
aqueous solvent, where the amount of non-aqueous solvent present is generally
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substantially less than that present in conventional food grade inks referred
to as
"solvent based
[0029] As used herein, a "solvent-based ink" is one that contains more non-
aqueous solvent than water. Solvent-based inks include pigmented and non-
pigmented inks, and also include inks in which the solvent is substantially
all fat,
wax, and/or oil. Solvent-based pigmented inks include a non-aqueous solvent
present in a range of about 15 to about 80 percent by weight, and particulates
present in an amount between about 5 and about 50 percent by weight.
[0030] As used herein, the term "image" refers to any picture or pictorial
image,
pattern, symbol, or alphanumeric character or group of characters that can be
stored in the memory of a computer, and reproduced on a substrate using an ink-
jet printhead. Images may be computer generated or scanned into the computer
used to control the ink-jet printer. Therefore, images that can be produced
with
the invention include without limitation alphanumeric character, computer
generated patterns and pictures, photographs, drawings, and the like. Images
may
be multicolored, preferably at least 3 colors, or multi-shaded. Unique images
that
can be produced with the invention include without limitation plaids,
paisleys,
and tie-dyed patterns. Using the method of the invention, confectioneries
having
a non-planar surface having such a unique image covering the entire surface
can
be made. As used herein, "color coat" means a coating that imparts a color to
the
surface of the sugar shelled, pellet-shaped confectionery to which it is
applied
and while the color coat may only be applied to a portion of the surface its
application will generally effect the design of the entire surface of the
sugar
shelled, pellet shaped confectionery. Thus, a color coat is distinguished from
a
discrete image that is printed on a relatively small area of a confectionery.
As
noted previously, however, discrete images may be formed by leaving a portion
of the surface uncoated. In some embodiments, preferably, the color coat will
cover at least 10%, more preferably at least about 25%, yet more preferably at
least about 50%, and even about 75% and sometimes about 100% of the surface.
[0031] As used herein, "ink-jet printing" includes continuous jet printing
systems and drop-on-demand systems. Continuous jet printing systems may
include a piezoelectric crystal that is used to break up the continuous stream
into
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drops that are then directed to a substrate to form an image. Continuous jet
printing systems that use a piezoelectric crystal to break up the continuous
stream
should not be confused with drop-on-demand piezo-jet systems. Piezo-jet
systems use a piezoelectric crystal to deform an ink-containing chamber when a
drop of ink is required, reducing the volume of the chamber, and expelling a
single drop of ink to the substrate. Only a single drop is produced, when
needed,
and directed to the substrate. Therefore, inks for such printers do not
require any
conductivity enhancers, which are required in inks for continuous jet systems
to
allow the drops to be guided by electric fields. In thermal bubble-jet
systems,
when required, the ink is sufficiently heated in a chamber to boil a small
amount
of the ink. The resulting steam forms a bubble that forces a drop of the ink
from
the chamber and onto the substrate. As with drop-on-demand piezo-jet systems,
conductivity enhancers are not required.
[0032] As used herein "high resolution" ink-jet printing means greater than
about 100 dot-per-inch (dpi). As used herein, "substantial registration" means
that the two or more component images of a composite image appear to form a
single recognizable image when observed by the human eye.
[0033] The present invention is directed to a method of applying at least a
portion of the color coat to hard-panned, sugar shelled, pellet-shaped
confectioneries with ink-jet printing of an edible ink. The method of the
invention reduces the time required to color hard-panned, sugar shelled,
pellet-
shaped confectioneries from about 3 hours using panning techniques to only a
few minutes. Pellet-shaped confectioneries include, for example, oval and
lenticular shaped candies, such as M&Ms Brand Chocolate Candies.
[0034] The method of the invention comprises ink-jet printing at least one
edible
ink-jet ink onto a shelled, pellet-shaped confectionery to form a color coat.
Preferably, the edible ink-jet ink is ink-jet printed onto a first side of the
shelled,
pellet-shaped confectionery, at least one edible ink-jet ink is applied to a
second
side of the shelled, pellet-shaped confectionery using ink-jet printing, and
the ink
is dried. Preferably, the ink applied to the first side is dried before the
ink is
applied to the second side. The ink-jet ink applied to the second side may be,
but
need not be, the same as that applied to the first side. Moreover, each side
of the
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shelled, pellet-shaped confectionery may be completely coated with a single
color
edible ink-jet ink, or a pattern or image may be formed by applying a
combination of inks (different amounts of one ink to provide different shades
or
different color inks) and/or leaving portions of the surface of the shelled,
pellet-
shaped confectionery uncolored. Preferably, the method of the invention is
employed to provide a substantially complete color coating surrounding the
pellet-shaped confectionery. However, some images, such as the "M" on
MSEMs Brand Chocolate Candies, can be formed by leaving a portion of the
surface uncolored, or allowing an under layer of color visible through an
upper
layer.
[0035] As discussed above, shelled, pellet-shaped confectioneries are
preferably
prepared in a panning apparatus in which a sugar-based coating, such as, e.g.,
sucrose or dextrose, is applied to a mass of centers. In the method of the
invention, the centers are preferably chocolate, and the shell is sucrose-
based.
Thin layers of a sugar-base coating solution are applied to an intermixed mass
of
centers in a coating pan, while mixing the mass of centers, and drying each
layer
of the coating solution, as is known in the art. In the method of the
invention,
once the sugar shells of the coated, pellet-shaped centers are fully developed
and
dry, they are transported to an ink-jet printing station by any means known in
the
art, such as by a conveyor belt, cart, container, or the like. The coated,
pellet-
shaped centers may also be stored for a period of time before printing.
Therefore,
the printing station and panning apparatus need not be in the same facility.
[0036] Ink-jet printing eliminates the need to contact the confectionery
substrate
with, e.g., a pad or roller, during printing. This is particularly important
with
hard-shelled confectioneries that crack if printing is not carried out
immediately
after panning when the shell is still relatively soft. Once the shell has
fully
hardened, cracking or fracturing of the shell with contact printing is highly
likely.
As ink-jet printing is a non-contact printing system, this allows storage of
the
shelled, pellet-shaped centers prior to printing, and provides reduced
breakage
when the shelled confectioneries are printed following storage. Moreover,
slight
variations in the size of confectioneries do not have a negative impact upon
printing quality as typically occurs with pad or roller-based systems. Non-
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contact printing also allows printing on curved surfaces, such as those of
shelled,
pellet-shaped confectioneries.
[0037] As the shelled, pellet-shaped confectioneries need not be printed
immediately after panning, they may be produced with only an uncolored sugar
shell, and stored for coloring at a later time. This is especially
advantageous for
custom orders and situations where the use of multiple pans for multiple
colors is
not practical or too expensive. By producing only uncolored shelled, pellet-
shaped confectioneries, only a single coating pan is required, as the colorant
is
applied on a separate line. The uncolored shelled, pellet-shaped
confectioneries
can be colored using the method of the invention to provide multiple color
confectioneries with only a single coating pan, as no color changeover of the
pan
is required. That is, the color change is effected at the ink-jet head, rather
than in
the pan. For multiple color ink jet systems, each shelled confectionery can be
colored individually with computer control. That is, a blend of different
colored
shelled, pellet-shaped confectioneries can be produced with the ink-jet
system,
eliminating the need for additional blending. Moreover, the colors in the
blend
and/or the ratio of the colors in the blend can be changed at any time with
the
computer control. The amount of dye and/or colorant required to color the
shelled, pellet-shaped confectioneries is also reduced, compared to panning
methods of coloring confectioneries.
[0038] In addition, the method of the invention allows customers to place
orders
for custom shelled, pellet-shaped confectioneries that are filled in a minimum
amount of time. A store equipped with an ink-jet printer for coloring shelled,
pellet-shaped confectioneries can color the confectioneries to order, and have
the
completed order ready before the customer leaves the store. With the method of
the invention, it is also possible to set up customer based/driven
customization
modules, i.e., "kiosks", in malls and shopping centers. Printing systems in
stores
and in such kiosks are computer controlled. Kiosks contain a supply of
uncolored shelled, pellet-shaped confectioneries and an ink-jet printing
apparatus.
A customer in a store or at a kiosk is able to select ready made greeting and
line
print, custom colors, patterns, and/ or images, including designer images and
images scanned into the computer, on the computer interface, and obtain the
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desired colored shelled, pellet-shaped confectioneries on the spot. Payment at
the
kiosk is by cash or credit card. The method of the invention also provides the
ability to produce full color and true color images on colored and/or dark
backgrounds.
[0039] The production of an ink-jet printer image is computer controlled, and,
thus, the image is stored as data on the computer, not on, e.g., a pad or
roller, as
in contact printing. As a result, the overall speed and throughput of printing
a
customized image on confectioneries is increased if an ink-jet printer is
used, and
images can be selected, altered, transmitted, and the like, more easily than
in pad
printing or offset printing, as the engraving of the custom images into image
rolls
is not required. This greatly reduces the time and expense required for custom
images.
[0040] The method of the invention may be used to form high resolution images,
i.e., greater than about 100 dpi on shelled, pellet-shaped confectioneries.
The
images may be alphanumeric characters, patterns, faces, or other similar
images,
depending on the application.
[0041] Multicolor images may be formed using a multicolor ink-jet head or a
plurality of ink-jet heads, preferably containing inks in at least three
primary
colors and black. White images or portions of images may be formed with white
inks, or by leaving portions of the sugar shell free of ink. The white ink may
be
substituted for the black, or a fifth ink-jet head for the white ink can be
added. A
food grade white pigment, such as titanium oxide, Ti02, or calcium carbonate,
CaCO3, may be added to the sugar shell to improve the whiteness. Similarly,
carbon black may be added to provide a black or gray color, depending on the
amount of pigment added. Such images may be formed using one or more inks
to color the surface.
[0042] Any arrangement of ink-jet heads is within the scope of the invention.
A
reciprocating ink-jet heat that moves over the candies to produce a color coat
or
image may be used. Preferably, however, the candies move past one or more ink-
jet heads. Where only a single color is required, a single ink-jet of any
color may
be used, reducing the cost of the apparatus. Moreover, with different color
ink-
jet heads, two different ink colors can be combined on the surface of a
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confectionery to form a third color, or premixed inks may be used to provide
the
desired color. For example, blue and yellow inks may be combined to provide a
green color, or a green ink may be pre-mixed and applied. It should be noted
that
mixing inks of two or three different primary colors can be used to for a wide
spectrum of colors and shades.
[0043] Preferably, during the ink-jet printing process, the shelled, pellet-
shaped
confectioneries are positioned under an ink-jet head in a mariner that aligns
or
registers the confectioneries with a printhead. This may be provided by a
plate,
belt, or drum containing a plurality of conveying pockets, cups, or other
depressions shaped to fit individual shelled, pellet-shaped confectioneries.
When
the position of the plate, belt, or drum is properly registered, at least a
portion of
the cups or depressions and, thus, any shelled, pellet-shaped confectioneries
in
the conveying pockets, cups, or other depressions will also be properly
positioned
under an appropriate printhead. The shelled, pellet-shaped confectioneries may
be transported to and positioned under the ink-jet head using a transport and
positioning system, such as that disclosed in U.S. Patent Nos. 6,286,421,
6,314,876, 6,450,089, and 6,481,347 all to Ackley.
[0044] Shelled, pellet-shaped confectioneries may be printed individually,
using
an apparatus comprising a single ink-jet printhead, or in groups, using an
apparatus comprising multiple printheads. If the position of eachshelled,
pellet-
shaped confectionery is registered, more than one printhead may be used to
form
an image. That is, the confectioneries may be moved from one printhead to
another to form a composite image. The inks may be applied sequentially or
mixed to provide the desired colors and images.
[0045] As noted above, there are generally two types of ink-jet printing
systems,
continuous jet and drop-on-demand bubble-jet and piezo-jet systems. In
continuous jet systems, ink is emitted in a continuous stream under pressure
through at least one nozzle. The stream is broken up into droplets at a fixed
distance from the orifice, typically by a piezoelectric crystal, which is
vibrated at
controlled frequency adjacent to the ink stream. The function of the
piezoelectric
crystal is different in a continuous jet system than in a piezo-jet drop-on-
demand
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system. In a continuous jet system, the ink stream is generated under pressure
in
the reservoir, and the crystal serves simply to break up the droplets. To
control
the flow of ink droplets, the inks are electrostatically charged (by addition
of salts
and other conductive agents) and the droplets are passed through an
electrostatic
field, which adjusts the trajectory of the droplets, in accordance with
digital data
signals. The conductance requirements for continuous jet inks therefore range
from 700 to 2000 micro Siemens, which generally requires that the ink contains
a
conductivity enhancing salt. The droplets are either directed back to a gutter
for
recirculation or to a specific location on the substrate to create the desired
character matrix. A typical resolution for a continuous jet printer image in
an
industrial setting, using a single printhead and a single pass printing is
about 75-
100 dots per inch (dpi).
[00461 Of the drop-on-demand systems, the most economically important today
are piezo-jet and bubble-jet (sometimes referred to as thermal ink-jet)
systems.
In bubble-jet systems, a bubble is formed by a resistance heater in an ink
reservoir. The resulting pressure wave from the bubble forces ink through the
orifice plate, and as the heat is removed, the bubble begins to collapse and a
droplet is ejected. Bubble-jet printheads dominate the home and office ink-jet
printer markets and they are capable of very high resolution. However, several
considerations limit their use for printing on edibles in an industrial
setting.
[0047] This viscosity of bubble-jet inks is very low, on the order of 1.5 cp,
necessary so that a bubble can form quickly upon application of minimal
voltage
to the resistance heater. The known bubble-jet printers cannot readily handle
the
presence of binders or polymeric additives. Moreover, the ink must be capable
of
withstanding the temperature cycling encountered inside the printhead. For
these
reasons, the number of inks which could be developed for printing on edibles
with a bubble-jet printer is extremely limited. The thermal jet printheads are
also
associated with ink drying on the surface of the jet channels. It would be
preferable if piezo-jet systems could be developed for printing on edibles, as
piezo-jet printheads do not require large temperature oscillations. Bubble-jet
printers are also much too slow to permit high speed printing directly on
edible
substrates. Thermal jet printheads (or bubble jet printheads, as they are also
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known) are used for transfer sheet applications, because the transfer sheets
are
porous and hydrophilic enough to be used with the known inks. Water-based
edible inks known to be thermal jet compatible are disclosed in co-pending
U.S.
Application No. 10/211,592. However, it has been demonstrated that these inks
are incompatible with hydrophobic surfaces, such as wax coatings on shelled
candies.
[0048] A method of ink-jet printing on edibles is described in U.S. patent No.
7,884,953. The ink described therein is a pigmented white ink which has
found utility for printing on chocolate.
[0049] Pigmented ink compositions, including non-white colored pigmented
inks, have been disclosed in the prior art, including U.S. Patent No.
5,800,601.
However, pigmented inks are less preferred for drop-on-demand ink-jet systems,
because the pigments can influence the rheology of the ink causing poor
jettability. Also, the presence of pigment particles may require additional
maintenance of the printhead. Once printed, the pigment particles tend to sit
on
the substrate surface, flaking off easily, or requiring the use of additional
binders
and/or resulting in poor image adhesion.
[0050] Piezo-jet printheads are characterized by a piezoelectric device which
causes ejection of ink from a reservoir, such as by a piezoelectric crystal
deforming the wall of the reservoir in accordance with data signals.
Heretofore,
edible inks have not been developed for these systems. Piezojet_ printheads
have
larger channels than bubble-jet printheads which affords a greater range of
acceptable ink ingredients.
[0051] On-demand systems typically produce higher resolution images, and
some commercially available printhead units, such as those manufactured by
Xaar, Trident, Picojet and Spectra, achieve high throughput rates even with
drop-
on-demand systems. Also, as drop-on-demand systems do not require ink
recovery, charging, or deflection, such systems are simpler than continuous
jet
systems.
[0052] Preferably, a high resolution image printed on a confectionery with a
drop-on-demand ink-jet system has a resolution greater than about 200 dpi,
and,
more preferably, greater than about 300 dpi. Most preferably, the image has
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photographic or near-photographic resolution, which is on the order of 360
dpi.
One skilled in the art will recognize that either process printing or line
printing
may be applied in the method of this invention, process printing would
require,
of course, multiple ink-jet heads, since the desired color is achieved by
providing
dots of different colors in close proximity that give the visual appearance of
the
desired color. On the other hand, only a single print head is necessary to
color a
hard-panned, sugar shelled, pellet-shaped confectionery in that color, since
the
desired color is premixed,and fed directly to the print head.
[0053] Both continuous jet and drop-on-demand systems can be adapted to
multiple-pass printing, where the printhead addresses the same region of the
surface of the confectionery in several passes to create a single image. For
this to
be accomplished, substantial registration is required. That is, in order to
print
composite images it is necessary to hold the pieces in registration so that
they do
not move between application of component images. Methods of accomplishing
this are disclosed in U.S. patent application No. 09/479,549 and in the Ackley
patents.
[0054] In preferred embodiments, a multicolor ink-jet printhead is used, such
as
a standard Cyan/Yellow/Magenta/Black printhead. High resolution multicolor
composite images can also be printed in substantial registration by printing a
first
component image of one or more colors on the surface of the confectionery, and
then printing one or more additional component images over the first component
image.
[0055] Ink formulations that can be used with the invention must be compatible
with ink-jet printheads. The terms "ink-jettable" or "ink-jet compatible" are
used
interchangeably, and include water-based and solvent-based inks that can be
ejected through a continuous jet or drop-on-demand ink-jet printhead. Solvent-
based inks include fat-, wax-, and oil-based inks.
[0056] The preferred ink colorant for use with the invention is an FD&C dye.
The FD&C dyes include Red No. 3 (Erythrosine), Red No. 40 (Allura Red),
Yellow No. 6 (Sunset Ye!. FCF), Yellow No. 5 (Tartrazine), Green No. 3 (Fast
Green FCF), Blue No. 1 (Brilliant Blue FCF), Blue No. 2 (Indigotine). Mixtures
of these dyes may also be used.
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[0057] Natural colorants, such as annatto seed extract, anthocyanins, which
are
found in various berries, grapes, cabbage, and cranberries, carotenoids, which
are
found in carrots, and oleoresins from roots, such as tumeric, paprika,
carmines,
beet roots, and tomatoes, are also useful in the invention. As some natural
colorants are fat soluble, and some are water soluble, the natural colorants
find
utility in both water and fat-based inks.
[0058] It is also possible to use pigments and lakes. Pigments comprise fine,
usually inorganic particles used to impart color when dispersed in a base.
Examples of pigments include, without limitation, kaolin, chalk, titanium
dioxide, and aluminum hydroxide. A lake comprises fine particles, such as
aluminum hydroxide particles bound to a colorant, such as one of the FD&C or
natural colorants mentioned above. Examples include, without limitation, FD&C
Blue #1 Lake, FD&C Blue #2 Lake, FD&C Yellow #5 Lake, FD&C Yellow #6
Lake, Erythrosine Lake, Amaranth Lake, Ponceau 4R Lake, Carmoisine Lake and
FD&C Red 40 Lake, all of which may be obtained from the Warner Jenkinson
Company, St. Louis, Missouri.
[0059] Preferred water-based non-pigmented inks include water in an amount
between about 30 and about 95 percent by weight, preferably between about 30
and about 85 percent by weight, and a soluble colorant in an amount between
about 100 ppm and about 5 percent by weight, preferably between about 100 ppm
and about 2 percent by weight. Water-based, non-pigmented inks suitable for
use
in connection with the present invention are available under product numbers
CI
15050-D, CI 10572-D, and CI 12022-D, available from Colorcon, Inc., West
Point, Pennsylvania. Another series of ink-jet printing inks is commercially
available from PhotoFrost Decorating Systems, Blytheville, Arizona.
[0060] It is also highly desirable to be able to print on the surface of
confectioneries using pigmented inks that provide at least some color opacity.
Preferred water-based pigmented inks include water, which is preferably
deionized, in an amount of about 30 to about 85 percent by weight, preferably
about 30 to about 75 percent by weight, and pigment particulates in an amount
of
about 3 to about 45 percent by weight, preferably from about 3 to about 35
percent by weight. The dispersion of the pigments in such inks generally must
be
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maintained, as known in the art. Usually, a dispersant, such as glycerine or
other
polyol, e.g., polyethylene glycol, is used in an amount between 1 percent by
weight and 50 percent by weight. Water-based pigmented inks may also contain
one or more non-aqueous solvents in an amount less than that of the water in
the
ink. Preferably, the non-aqueous solvents are present in an amount of less
than
about 40 percent by weight. Preferred water-based pigmented inks may
optionally contain one or more dyes in an amount of 100 ppm to about 2 percent
by weight.
[0061] An exemplary water-based white pigmented ink suitable for use in
connection with the present invention comprises from about 10 to about 45
percent by weight titanium dioxide, from about 1 to about 48 percent by weight
dispersant, preferably glycerin, up to about 40 percent by weight lower
molecular
weight alcohol, preferably ethanol, from about 30 to about 75 percent by
weight
water, and less than about 1 weight percent surfactant. Other water-based
pigmented inks, such as those described in U.S. patent No. 7,884,953 may be
used as well.
[0062] Edible solvent-based inks useful with the invention include pigmented
and non-pigmented solvent-based inks, which, as noted above, may be fat-, wax-
,
or oil-based inks. Solvent-based pigmented inks include a non-aqueous solvent
present in an amount of from about 15 to about 80 percent by weight and
pigment
particulates present in an amount between from about 5 and about 50 percent by
weight
[00631 Fat- and oil-based colorants useful in the invention contain a food
grade
colorant, a dispersant to carry and/or dissolve the food colorant, and a fat
or oil
base, where an oil is defined as a fat that is liquid at room temperature.
"Fat" as
used herein includes both fats and oils, either of which may be saturated or
unsaturated, and may include substituted and unsubstituted hydrocarbon chains.
Fat also includes "fat-like" substances such as limonenes and terpenes, and
also
includes lipids. Suitable fats that can be used to make the colorants of the
invention are hydrogenated vegetable fats, milk fat, cocoa butter, edible
fractions
of mono-, di- and triglycerides and their derivatives, fats commercially
available
under the brand name Captexe 300 brand triglyceride, and vegetable oils.
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[0064] In preferred embodiments, the food grade colorant is an FD&C dye
dissolved in a fat-dispersible carrier. The dye and carrier together form a
dispersed phase that is distributed in a fat-based continuous phase. In other
embodiments, the colorant is a pigment or lake having a fine particle size. In
this
case, the carrier need only disperse the colorant and mix well in the fat
phase.
The carrier does not need to dissolve the colorant. Finely divided pigments
may
also be added to improve the opacity of the colorant.
[0065] Where an FD&C dye is used with a fat-based colorant, it is necessary to
dissolve the food colorant in a carrier, which is then dispersed into the fat
phase.
Preferably, colorant is added to the carrier in an amount close to the
solubility
limit of the carrier for the solvent. The preferred carrier system for FD&C
dyes
is based on one or more polyols, such as propylene glycol or glycerol. It is
also
contemplated that the colorants can also be dispersed into water or other
polar
solvents prior to dispersing into the fat phase. The important characteristics
of
the carrier system are that it can dissolve the colorant, and is dispersible
within
the fat phase. Preferably, the FD&C colorant is soluble in the carrier in an
amount at least about 1 gram per 100 ml, more preferably, in an amount greater
than about 5 grams per 100 ml, and, most preferably, in an amount greater than
about 18 grams per 100 ml, where the upper limit to the ink concentration is
the
solubility limit of the ink in the carrier. Polyols have a good balance of fat-
compatibility and solubility for most colorants.
[0066] To prepare the fat-based colorant solution, the colorant is simply
added to
the carrier and mixed. However, it may be necessary to filter the
carrier/colorant
mixture. If a colorant is added near the solubility limit of the carrier, a
2.7
micron filter may be used to remove larger particles. In the case of a pigment-
based system, a 10 micron filter may be used to remove the largest particle
size
pigments.
[0067] Similarly, wax-based colorant solutions may be used with the invention.
"Wax" generally refers to edible waxes such as carnauba wax, bees wax, and
candelilla wax, which are solid at room temperature. A combination of waxes
may also be used. Wax-based colorants useful in the invention contain a food
grade colorant and a wax base, and require a dispersant to carry and/or
dissolve
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the food colorant in the wax base. In preferred embodiments, the food grade
colorant is an FD&C dye dissolved in a wax-dispersible carrier. The dye and
carrier together form a dispersed phase that is distributed in a wax-based
continuous phase. In other embodiments, the colorant may comprise a pigment
or lake having a fine particle size. In this case, the carrier need only
disperse the
colorant and mix well in the wax phase. The carrier does not need to dissolve
the
colorant. Finely divided pigments may also be added to improve the opacity of
the colorant.
[0068] The preferred wax-based material undergoes a phase change from a liquid
state to a solid state upon contacting the substrate surface. By undergoing a
phase change, the wax provides certain properties to the inks such as opacity,
good adhesion to the substrate, and good surface chemistry for printing onto
hydrophobic substrate surfaces, and the ability to print onto non-porous
surfaces.
[0069] The surfactants that may be used in the ink of this invention include,
for
example, anionic surfactants, cationic surfactants and amphoteric surfactants.
Of
course, the surfactant used must also be edible in the amounts used.
Polyglycerol
oleates, monostearates, polysorbates, mono- and diglycerides, and
phospholipids,
including without limitation lecithin, may be used for this purpose.
Generally, a
surfactant will be present in amounts less than about 1.0 weight percent. Most
preferably, the surfactant will be present in an amount between about 0.001
and
about 0.5 weight percent, based on final ink-formulation.
[0070] All of the above-described inks may also include conventional additives
such as flavorings, preservatives, antifoam agents, micronutrients, dispersion
stabilizers, anti-bloom agents, anti-oxidants, film formers and binders,
proteinaceous materials, and the like, as practiced in the art.
[0071] The water-based or solvent-based ink used in connection with the
invention must be compatible with the ink-jet head used for printing.
Preferably,
ink-jet compatible inks have a viscosity of about 1 to about 45 centipoise, a
surface tension of less than about 50 dynes/cm2, and a particle size
compatible
with the ink-jet printhead channel. Therefore, the particle size is preferably
less
than about 50 microns, more preferably less than about 40 microns, and most
preferably less than about 30 microns. For very high resolution images, the
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pigments preferably have an average particle size less than about 5 microns,
and,
for photographic quality images, less than about 1 micron. Such small particle
sizes may be obtained by ball milling lakes or pigments to the desired size.
[0072] The surface chemistry of the ink and the surface of the confectionery
piece to be printed each play a role in determining the final image quality
and
resolution. The temperature of the substrate and/or that of the ink can be
modified using a stream of dry gas to assist the rapid drying of ink droplets
on the
surface of the confectionery piece. Temperature modulation will affect the
surface energy properties of the ink and confectionery surface, with lower
temperatures lowering surface energy and reducing the tendency of an ink to
spread across the surface of the confectionery. Applying a low humidity drying
gas, such as dry air, will enhance the drying rate of the ink droplets.
Temperature
modulation of the ink cartridge can also be used advantageously to modify or
control ink rheology to maximize printing performance.
[0073] The ink image may be optionally dried simply by exposing the printed
piece to air without contacting the image for a period of time that is
preferably
between 30 seconds and five minutes. Advantageously, convection drying with
heated air evaporates solvents from the ink in less than thirty seconds, and
preferably in less than 10 seconds. After printing and drying, or simply after
printing, a further coating of water-based glaze or polishing gum or shellac
may
be applied to set the image. This has been found to fix the image, and reduce
the
likelihood of image distortion. A non-contact manner of applying the glaze,
gum
or shellac is used, such as spraying or air-brushing, so as not to smear the
image.
[0074] If multiple component images are to be applied to form a composite
image, the further coating of water-based glaze or polishing gum enhances the
compatibility of the printing surface for the application of one or more
additional
ink-jetted images.
[0075] After printing, in preferred embodiments, a wax coating is applied to
the
colored confections. The confections may be returned to the pan for
application
of a hydrophobic finish. Preferably, the hydrophobic finish is applied in two
coats, a wet wax coat comprising triglycerides and camauba wax and a dry wax
coat, consisting essentially of camauba wax. Such an application of a wax
finish
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is well known in the art. However, it has been surprisingly discovered that a
wax
coating can also be applied with an ink-jet head, where the ink-jet is
preferably an
drop-on-demand piezo-jet. Wax coatings that can be applied with an ink-jet
head
include without limitation carnuba. The wax coating may be applied over the
entire surface of the colored confectionery or only over an image.
[0076] A sugar shelled, pellet-shaped confectionery 10 colored with the method
of the invention is illustrated in Fig. 1. The colored sugar shelled, pellet-
shaped
confectionery a sugar shell 11 that may be colored and an image 12 ink-jet
printed on the sugar shell 11. As discussed above, the sugar shell 11 may be
colored to form a base color by ink-jet printing before the image 12 is formed
on
the shell. Such a sugar shelled, pellet-shaped confectionery 20 is illustrated
in
cross-section in Fig. 2. The colored sugar shelled, pellet-shaped
confectionery 20
illustrated in Fig. 2 comprises a confectionery center 21, a hard-panned sugar
shell 22, a color coat 23 formed by ink-jet printing, and an ink-jet image 24.
[0077] An image can be printed on a hard-panned, sugar shelled, pellet-shaped
confectionery with the method of the invention as follows. A conventional ink-
jet printing apparatus is modified to operate using an edible ink, and to
print on a
hard-panned, sugar shelled, pellet-shaped confectionery. The ink-jet printing
apparatus is preferably a drop-on-demand printer, and, more preferably, is a
drop-
on-demand piezo-jet ink-jet printing apparatus. The preferred drop-on-demand
ink-jet printing apparatus comprises at least one reservoir cartridge for
holding
edible ink. Each reservoir cartridge is integrated with a print head that is
configured to print on hard-panned, sugar shelled, pellet-shaped
confectioneries.
The apparatus comprises at least one driver that drives one or more of the ink-
jet
prints head according to instructions corresponding to processed digital image
information received from a computerized controller. The apparatus preferably
comprises a conveyer for passing hard-panned, sugar shelled, pellet-shaped
confectioneries under the print head or heads during the printing operation.
However, the hard-panned, sugar shelled, pellet-shaped confectioneries may be
held stationery as the print head or heads pass over the confectioneries to
print
the image.
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[0078] The digital information of the image to be printed is processed by the
computerized controller, and converted to a format that is compatible with the
ink-jet print head driver. This digital image information in the compatible
format
is then communicated to the printer to enable the printer to produce the high
resolution printed image on the hard-panned, sugar shelled, pellet-shaped
confectioneries. In one preferred embodiment of this invention, the digital
image
completely covers the surface of the hard-panned, sugar shelled, pellet-shaped
confectionery with a single color. The digital image information for the
printed
images may be processed to provide a printed image having an appropriate
intensity and contrast relative to the uncolored background shade, i.e, white,
gray,
or black, of each hard-panned, sugar shelled, pellet-shaped confectionery.
Where
a complete color coat of the hard-panned, sugar shelled, pellet-shaped
confectionery be applied by ink-jet printing before printing the image, the
digital
image information for the printed images may also be processed to provide a
printed image having an appropriate intensity and contrast relative to a
background color provided by ink-jet printing. Preferably, the image
processing
provides control of the intensity of the brightest area of an image, the
electronic
separation of an image, such that it can be printed in multiple applications
of ink,
i.e., multiple passes through printer, brightness equalization across the
printed
area, and sectional control of image brightness and contrast.
[0079] In a preferred embodiment, the image is a digital photograph or the
like,
and the digital image information is processed to enhance image brightness and
contrast prior to printing. This can be accomplished, for example, using an
image
processor such as Adobe Photoshop . An edible ink of the appropriate
composition and color is provided in each reservoir cartridge of the ink-jet
printer. For a single color image, only a single print head and reservoir
cartridge
is required. For full color images, the ink-jet printing apparatus typically
has four
print heads and reservoir cartridges, one for each of three primary colors and
one
for black. If a white ink is required for the image, the black ink cartridge
is
replaced by a white ink reservoir cartridge, or a fifth cartridge containing
white
ink and the corresponding print head are added. The particular arrangement of
the reservoirs is not particularly critical. Preferably, for pigmented inks,
the
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reservoir is ultrasonically mixed prior to printing to disperse the pigments
in the
ink to prevent the nozzle from becoming clogged. Preferably, the ink reservoir
cartridge is ultrasonically mixed intermittently during the printing
operation.
[0000] During printing, the hard-panned, sugar shelled, pellet-shaped
confectioneries are held and conveyed past the print head or heads, or the
print
head or heads are moved relative to the confectioneries. The digital image
information provided by the computer to the print head driver is used control
the
ink-jet head or heads to apply ink to the hard-panned, sugar shelled, pellet-
shaped
confectioneries to form the desired image. Where printing is desired on both
= sides of the hard-panned, sugar shelled, pellet-shaped confectioneries,
the
confectioneries are printed on a first side, and preferably dried. The hard-
panned,
sugar shelled, pellet-shaped confectioneries are then conveyed to past a print
head
or heads, which may be the same or different as those used to print the first
side,
and a second side is printed. The printed hard-panned, sugar shelled, pellet-
shaped confectioneries are then dried.
100811 Accordingly, it will be appreciated that the present invention has been
described with references to particular preferred embodiments that are now
contemplated. However, the invention is not limited by the embodiments
disclosed herein and it will be appreciated that numerous modifications and
other
embodiments may be devised by those skilled in the art. Therefore, it is
intended
that the appended claims cover all such modifications and embodiments that
fall
within the true spirit and scope of the present invention.
